Usage:
El Vado Sandstone Member of Mancos Shale (NM*)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Type section: below the 7,388 ft elevation point, 2.4 mi east and 1 mi north of southwest corner of Tierra Amarilla Grant, and about 2 mi southwest of emergency overflow outlet for El Vado Reservoir, Boulder Lake quadrangle, Rio Arriba Co., NM. Named from El Vado Reservoir (Landis and Dane, 1967).
Reference section (subsurface): Caulkins Oil Company No. 140 Breech D well, in NE/4 NE/4 sec. 11, T. 26 N., R. 6 W., Rio Arriba Co., NM (Fassett and Jentgen, 1978).
AAPG geologic province:
San Juan basin*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).